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small amounts of data requires signi cant overhead, so escalating locks to higher levels can substantially improve performance Typical lock levels are as follows: Database The entire database is locked so that only one database session may apply updates This is obviously an extreme situation that should not happen very often, but it can be useful when signi cant maintenance is being performed, such as upgrading to a new version of the database software Oracle supports this level indirectly when the database is opened in exclusive mode, which restricts the database to only one user session File An entire database le is locked Recall that a le can contain part of a table, an entire table, or parts of many tables This level is less favored in modern databases because the data locked can be so diverse Table An entire table is locked.

COMMIT;

As you can see, the COMMIT keyword is the only required element. However, if you want a new transaction to be initiated after the current one, you should use the following COMMIT statement:

Figure A-2.

COMMIT AND CHAIN;

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This level is useful when you re performing a table-wide change such as reloading all the data in the table, updating every row, or altering the table to add or remove columns Oracle calls this level a DDL lock, and it is used when DDL statements (CREATE, DROP, and ALTER) are submitted against a table or other database object Block or page A block or page within a database le is locked A block is the smallest unit of data that the operating system can read from or write to a le On most personal computers, the block size is called the sector size Some operating systems use pages instead of blocks A page is a virtual block of xed size, typically 2K or 4K, which is used to simplify processing when there are multiple storage devices that support different block sizes.

Appendix:

Although the goal of any transaction is to commit the changes made by the statements in that transaction, there will no doubt be times when you want to roll back those changes. To be able to control these rollbacks, you must use a ROLLBACK statement to undo changes and terminate the transaction, or to undo changes back to a specified savepoint. The following syntax shows the various elements that can be included in a ROLLBACK statement: ROLLBACK [ WORK ] [ AND [ NO ] CHAIN ] [ TO SAVEPOINT <savepoint name> ] The first line of syntax is very similar to the COMMIT statement. You must specify the ROLLBACK keyword. In addition, you can specify WORK, AND CHAIN, or AND NO CHAIN, all of which work the same way they did in the COMMIT statement, with AND NO CHAIN once again being the default.

16:

mation in the Knowledge Base is available from Microsoft s TechNet and from Microsoft Support Online. Microsoft has made its extensive Knowledge Base available online via the Internet. To access Support Online, point your browser to support.microsoft.com. The first time you visit the site, you ll be able to specify the type of user you are and receive the appropriate search options. Then, you ll be able to search for information on any Microsoft product by entering text search strings. Figure A-3 shows the Microsoft Product Support website (support.microsoft.com).

The operating system can read and write pages and let hardware drivers translate the pages to appropriate blocks As with le locking, block (page) locking is less favored in modern database systems because of the diversity of the data that may happen to be written to the same block in the le Row A row in a table is locked This is the most common locking level, with virtually all modern database systems supporting it Column Some columns within a row in the table are locked This method sounds terri c in theory, but it s not very practical because of the resources required to place and release locks at this level of granularity Very sparse support for it exists in modern commercial database systems Locks are always placed when data is updated or deleted.

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